Al-Omiri M K, Al-Wahadni A M
Department of Restorative Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
Int Endod J. 2006 Nov;39(11):890-9. doi: 10.1111/j.1365-2591.2006.01166.x.
To investigate the fracture resistance and fracture patterns of teeth restored with composite cores supported by different pre-fabricated post systems and different heights of remaining coronal dentine.
Four groups of 30 single rooted teeth were used. Each group was divided into three subgroups of 10 teeth each and restored with carbon fibre, glass fibre, or Radix titanium posts luted with dual cure resin cement. The control group A had no retained coronal dentine. Groups B, C and D had 2, 3 and 4 mm of retained buccal and lingual coronal dentine, respectively. Teeth were tested to failure using an Instron Universal Testing Machine. Subsequently, the fracture mode of specimens was recorded.
Teeth with retained dentine were more resistant to fracture (P = 0.001). Tooth fracture resistance was not significantly different between groups B, C and D. Within group A, titanium posts were associated with higher fracture resistance than fibre posts. Within the other groups, tooth fracture resistance was not related to post material. Within groups C and D, fracture resistance of teeth restored with carbon fibre posts was significantly higher than those restored with glass fibre posts. The dominant fracture mode in group A was core and vertical oblique root fracture whilst a combination of core, coronal dentine and root fracture occurred in the other groups.
Fracture resistance of teeth increased with the presence of retained coronal dentine. The use of glass and carbon fibre posts did not improve the fracture resistance or the fracture pattern of teeth when compared with metal titanium posts regardless of the presence of retained coronal dentine. The dominant fracture pattern of teeth was not related to the amount of retained dentine if it was >2 mm high.
研究不同预成桩系统及不同剩余牙冠牙本质高度支持的复合树脂核修复牙的抗折性能及折裂模式。
使用四组，每组30颗单根牙。每组再分为三个亚组，每组10颗牙，分别用双固化树脂水门汀粘固的碳纤维桩、玻璃纤维桩或钛根管桩进行修复。对照组A无剩余牙冠牙本质。B组、C组和D组分别有2mm、3mm和4mm的颊舌侧剩余牙冠牙本质。使用英斯特朗万能材料试验机对牙齿进行测试直至破坏。随后，记录试件的折裂模式。
有剩余牙本质的牙齿抗折性更强（P = 0.001）。B组、C组和D组之间的牙齿抗折性无显著差异。在A组中，钛根管桩比纤维桩具有更高的抗折性。在其他组中，牙齿抗折性与桩材料无关。在C组和D组中，用碳纤维桩修复的牙齿抗折性显著高于用玻璃纤维桩修复的牙齿。A组的主要折裂模式是核及垂直斜向牙根折裂，而其他组则出现核、牙冠牙本质和牙根折裂的组合。
剩余牙冠牙本质的存在可提高牙齿的抗折性。与金属钛根管桩相比，无论是否存在剩余牙冠牙本质，使用玻璃纤维桩和碳纤维桩均未改善牙齿的抗折性或折裂模式。如果剩余牙冠牙本质高度>2mm，牙齿的主要折裂模式与剩余牙本质的量无关。
